Family name Орест-Сергій (Орест-Сергій 
) , around the globe, is an extremely rare last name. Much more frequently, Орест-Сергій is the forename as well as the last name. Parts of the name also exists independently as a first name Орест, and a first name Сергій.
| VARIANT | COUNTRY |
|---|---|
| Орест-Сергій | Ukraine |